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I have figured that intermittent fasting + 4 tea bags of green tea ( coffee comes after first meal, after 1p.m ) makes me sharp through out the entire day. Maybe try that? Also I occasionally visit gym and cycle to work.

I was going to suggest exercise and outdoor walks but I see you're already doing that. If you've had this issue for a while you should probably talk to a doctor. Also make sure you're eating enough fresh fruit and vegetables.